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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3b6e23d371ec1998e4c683d5112436b4853e9eb9d8b1f4ad690bd526281fff' 
  AND token = 'VxXD3S7UguafPOXkBT+mZrS8nOhDjXA2Qqd5lVelrjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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