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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee8f2b46462dc0c9732e80036a9f96341bc5df49f9ab7ee74e56616eef44874' 
  AND token = '+svHrK2GpE+o3wb/fHf+kQ8ODC6j3xPleOfng0NnBTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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