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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e824c0d75a04d75a7e7693b0d21ecae5b94e7fea359ea6f8cd7f4ab29ec25123' 
  AND token = 'tYQ0VWjmRUe24o3PMbBpoTzcKnodA0ygIMi1y/ABRao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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