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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91091d42bf8161000b879c25019e7ac715994fa36a8a28082463e73f389aa3e0' 
  AND token = '7g17jd7ihATjU3kClDbfAtsAsV4c9gOr1tLdE/Su9Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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