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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb3c2e1ffbf3268c3f8413ea41e389edac0f61c4df62139944e60aee786364b' 
  AND token = 'Vg1HE1GQxtfklzno0wApIDXoWuULvw8awKa8UJc2F9M=' 
  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"
    }
  }
}