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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3793f0a28c2b3c20afcf24ffd9b8302d7c2aa78570d204cba67d6c6f1f5aec1' 
  AND token = 'GwHVW/rJ2v+QTq5C7wNMnZx0Boa54XXn1jJdvWM4t9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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