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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3c2b61b97a0d9ea24bfe441823f26911170c479621cd0b7a58d0e99d2f0d49' 
  AND token = 'omdkWeRkl6mq0146eU0Mp07WGe4Ccj93vk6cJ4gJugo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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