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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db10fb2c9c4f1b48da2fd4df646d36c267f59cd3ab85b57daedabbd3646aa57' 
  AND token = '0Fqv4g969DU6PoM3j2pe0O5j2ZahD8FjSsKNoA0h/Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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