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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46f5442adf4fa5561f0ea609116034b169c47b176b4566a43160666ea82175d' 
  AND token = 'dz394b4Ca8Oq/Jy5MwMQOxO6CY4DjAAulm/hnnuEc7c=' 
  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"
    }
  }
}