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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb6b598812acb2a1dff1ca5d57423fe53280701107ed60567f92544215bf4e7' 
  AND token = 'Mdm8cYEkAp2+PnbX/qMn72fYMZZvYUchFr5cWm2PSqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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