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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9694001bce901b5df602c556e88a5feca5f365eed952e59f73ee51a687e6c1cb' 
  AND token = '36C4ZSXHozLBtqQBfzD5G19Js9TvN3FsninjggknLCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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