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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff25de3b729a2c7aa9b3da7079284a3145b9d768b0a88c7a54bccd0bf4ba0e0' 
  AND token = 'TsjxKE+mzmm6/x2DIUT5Xi/eAbwLnhIyw0TuMUC+Z80=' 
  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"
    }
  }
}