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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad8efdcd55b077799139bf70404c370e74f69cdf466fbf821d1b59257f37703' 
  AND token = 'Gm4L54j5Y7cUzTS8QcyL1KckKLn9EbXEnXiOuiOFhXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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