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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8524f46a2094d9fd96d0b3fd48f730c79a1b1909e80d13c000447f02a89ce82b' 
  AND token = '8/eHKAhS6IaK/IfV/INksNXkcZWMuB8L/Yes+hBh1I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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