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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a554f9ab37d498d7e131a522b02c55f720009416da295a05fc6c46bbabc294' 
  AND token = 'G89p0Z3XpAo3w/xim7GG5CFCN7ARbAIPjeR0XqzX+lY=' 
  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"
    }
  }
}