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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97def8aed7200313a58263688dcd4993835ec93a64ba522235f658480f1903b1' 
  AND token = 'hiLyv4OsU190S1BGfafOdqNwVyP0yAVgoHR0aR2Cs3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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