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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c984614b22ac006c7d12c8f036a36aeeae7785053c1194471e366f0b09f155' 
  AND token = 'v8iRs7NI1Zq0sk5YG/nPSxR+D+AQ9JnLaAb6eo0LSC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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