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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d873148725e3786d3b96e9c809cdc90473f690056d89a330c46f69276a43a50' 
  AND token = 'DfcdQW2o/Zv5oj3dtxjVSQHOdRGOTIIR5tWKn80Axp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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