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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10cbe61d4ef82b08ef701528ef7e2ab0f6636c503677e339b5c05bae0f8e38f' 
  AND token = '+yQhpwk7wTXY2N6DvVG2wJ65s4WRbKnPb2kX6z90G1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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