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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e78af1cc72985ef9433e98ce0d9cb0782b36380cc7f9d7064c5b7f8c4807b8' 
  AND token = 'EKYgQ5CGJdSkJHk8pDAexggQhDTU3eHffEjqmq3bQZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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