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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4015e7a7b393ae3a436e0941d83f0f05bacc1885a61e6c2480ac1fc87229a4' 
  AND token = 'JaO0XpvJknSsX3QVAIz0VhWti5v6nYRvxnCncN9tp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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