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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee616bf07bfd414431d437f4c4205b653af50e1b69434c2eca6a67436494a32' 
  AND token = 'zSkEJUoc/Ehs/L2upvsA2nXkTBjVv3Fok/X7pbEEYxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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