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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd3467d50de5b739d44c1f2ecdb18fe9302dcc13e88070887ad4e0a5176fb10' 
  AND token = 'MN4Aykrg+eS+aoRNkStu4qZhYLH4Ipe3PMaPztauJtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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