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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bad16419c28e9ec3dc923561b13c6b3e632db946f49db89ed07cc84bf7e4b2c' 
  AND token = '4KbnLUQsNS9dhlK6dB1+AV8Gnpvt/taLmoQ/hMhOM8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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