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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd866ddf459d93d28b3246a63473dc8dd71e10f7822b52485552b471c090cf8c6' 
  AND token = '15OQB4jF0s78tUpO7yOveKaPRet0CzUyjlBglEPxW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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