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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077651dfc7671a74fdf458ee44c990a44a5359c3f2b262f10549f76c950e935c' 
  AND token = 'jG5/5MblgNCKJFC6PffDeevo6eJdzhTdD30rvaYVnWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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