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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea0a3328ea2913810606d2fbd1d6a51ec435905369c34f82d69d9c81535cd3e' 
  AND token = 'WrC5s4D38mCm5t9Vou8TgmI4rKlANzzl6jkU0PJvleQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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