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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bb1e0e7450b1d84e548a7e9a9e087a5efb05859865c3b985eb8e4e5f3d8ff8' 
  AND token = 'OE8MUYQP5OrZxcf3vQLHd2wTPxZy6a4bkBEyEgytq6w=' 
  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"
    }
  }
}