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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba721e1b5cf21b4298bfed8b0f465e1f48502f852cc31dcd0b2827f295b96f7e' 
  AND token = 'j9BcT0gpFZ+GIF9qaVWSFsaSZmb7Pe9F9usDBgK0oc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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