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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd147cfa00bf6612c382d5e299ab030a0b039e9d2a82b6d055e3018433d91478a' 
  AND token = 'MsZ/yyfKBPeL14aotlWEe9SDfI4SPVz6HEkx2BP3M90=' 
  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"
    }
  }
}