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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0796bfb7a50a784f9f1b57bc9cc2e57496629ede9405456dd57f0c557b989f84' 
  AND token = '1ql0fz9vpDpzpZxvyfuPj39rXvbPAXolW5kjmrBnU1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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