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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58085987d940973a3c4dbbabb072c83af4974f5344a6a88003aaefb776b8e1e' 
  AND token = '5Zk5efRhaIUuOD8g3Byp8JMoTTH6FlAmMP5L9+bMeAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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