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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd40755216e3596adfb956c2e261e1cd7f4597167f617d0a299c321fbf87df3a' 
  AND token = 'cyIT0I4QcInMuDEg/APif5b2TnmYpsDCw9Mv24h3pQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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