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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e4e9d7e3d2e1f7c9aeacaa41b14f058ef17a8a2a5e0953abc4d34f0d22e12f' 
  AND token = '5uAKM4BSm83a/9UAuWSYejIDKv3wh4tgLo1A94MuoGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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