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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e8efcc901b38ce0741bc9f0a74bde211ed7832bd22e5b0a5b4d9cc47939997' 
  AND token = 'Z58JRMU9FkmAraMrEu2feL4LQBql5FhmTNQACt0aClM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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