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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c3873a1898bd2fa59467b3dda50023e3180387057d9b85468c14cd709e578f' 
  AND token = 'L2ofQDCrbVePpLAKAyWj8c/yb70S/AaG8c79BCXXxXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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