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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c10f61c555f447e7137bc083cec7c193dfc3aa84965dbd257eb1336629b936' 
  AND token = '3bdqemPWZ11aR7siHF3uxPsO67GTjTb/uYG+Ty3ln/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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