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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9015ed39829e7f597c30d729b6e8c2542bd23526ffe7a108da3b7764ebfd9b33' 
  AND token = 'oMLkw0ug4igF0OatTVpg6C0fEX3flNmZRaK6qxN0umI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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