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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf12e732e3050ce4c1654b1696361d645c2d34612b56f3583237fe677c39ce4' 
  AND token = 'Ee3P6oJ4dI/BNd7KKin7D/iK6Fuh18O+GLTexFujxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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