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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1250a7497e7f97ef36eb99fe498b6433451332f8c5d6cd44e7b7b18b826ac117' 
  AND token = '0AY3y2fEWRwCQRIMM2qF3mP28/7YRVIRzdgIfYFRIOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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