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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8230651631b7c6303ca245c4d42e716a4c87104c7b8c2bb4849ac5d1334a4312' 
  AND token = 'ancKn7dez+qVXo6s1IHa4iynCyNY7R0PYWPKLKox5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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