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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b97a630da7b8a77f3c4f2eda95a9f4b8bafce32f065fc23484a380c4a25f60d' 
  AND token = 'cy/z6v3MSjj56odlBpNb1r+FeVECSTXnX+qn5VutNhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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