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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa5534dca084b8599ee6d36e93623b007c08e1392cb014f8550346064208d08' 
  AND token = '5I+/HfbkLAThYOA9T47GhcWR6L1Yj0bMYxgSFa5cZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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