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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe766bd69b55b872baeb250b124d860e7cb8a1963fd9dbf0d01285ab0776299' 
  AND token = 'GJf7bG6sw1ob4PD3f1Yv7DSW+hkdQwkTu9PsQt2te6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}