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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a528cfb0fd6a4d2402ea3e5fe5c41b64b883639bd91d73056c15c890a80ca125' 
  AND token = 'mYHo/v363scwYIR+Od9S2ZpBZSUIXYaHZBzVot5ty8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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