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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef2251d6eaee7c06085e88a58d8aa7f48a55d7ca0096f73e73227715444844e' 
  AND token = 'Ghm46l6Y7KF670f1yyp8ZVJyjlMigOdcG0WJMW6dqss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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