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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a5d4a17be6e16a7b5a30dcfb0fcd4042ec1da0b95f16a94a13749a5810ab8f' 
  AND token = 'w4sjirB2cDm+Jjay/+IdKw1oyQX5Nd9hrpO6EsaVYQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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