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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9301ac3abfc8b857de3ae9314cd6879470bcb33fb6a541e9fc5c218e9b8297d' 
  AND token = 'Ax2wGf1an6YV+Vmso7uoMVz371ye/h4trJPB4WQuees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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