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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c53b74f732b72f0d41c8b40ea8946ae3273f2d68cd4a4a97226fe571a40bc0' 
  AND token = '+IGBwWoQrP1yqf1+0cv9oQ6gSZuqctIxrK8SOaD9G1s=' 
  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"
    }
  }
}