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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9f9c749c3b269d3e9a3ca3fe727213d8f15f1bedda7af1aaa849e7f47392fc' 
  AND token = 'Ivhj3BDzQKvdsJX42ivjFg356LW3Rc76bgP+IBTuo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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