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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dee14c2f462c8dbe1b72b69b4e9da39707753aedcc48d965b65db3b7b8c396' 
  AND token = '7lYgO3DXKkfTdcDBZSodAHO+QZwW0cmYrVrJ1yEJL9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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