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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9a298927b6e4ad0c7afc5a85b3c1724b6c71d6fd83feaa2fb78dad0777eb1b' 
  AND token = 'BKdhmdeX9MeXQw2Co8i4zZQmG59DOWdqOJd2FW8TzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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