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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6f6292650736f920461fb81d06e8cc1a247a3510f416018c32ea372bc45979' 
  AND token = '29odp27xYw0i4/VhrWVuEfLs1l+GSi7ORbrgApBXne4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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