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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9958ea7729645cd04976a288d07e852f06a9198fe38ac439d07d15cec6d72a3e' 
  AND token = 'EbGI/oMD8nO9JqgEa+aW0sMlDhzlK94n/6SCc9VanLU=' 
  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"
    }
  }
}