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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad50302062b7e22656523773f0403cd5b70226f6607465e2e36aba5dcd2b6a6c' 
  AND token = 'qaIuBAuzwCr5+iKh2tFXe0WvcYJ92/lSobxl3fLcf/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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