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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4af10a6956e402e5ff895dcf28aa4987e2e5e9ab8a15234c6fa0ad3e9afc1f' 
  AND token = 'Ml3XwJptTfa+ZId/vE/Nn+Kt+D9LqgGK18IjffbR3l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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