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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d68aebbe25dfa88adb13c93a99a4fb76d64a6850b31158a6cea07efc81fb4a' 
  AND token = 'YSP74dfNSVgUX6kLaIggNoOaDGBH0A00JmZEZmtLvno=' 
  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"
    }
  }
}