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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c3299eb05e83727ef835f6608246936ae4ae8c6587e12a6a0010eb9401f56d' 
  AND token = '4twkyywMA6MB59cWymcVTTW7tD3HCR0djBTsc1WIdxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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