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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4780f200194a58b04fc055af1149b340facf5cddcca8a17d506428469a48052f' 
  AND token = 'Q3ay9g9dBRzeN5XV4EqFOIjKzflM8yHkwUdQEIi8KGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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