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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb70864c88281e95675bd64c5236b9d2a58a2f4a2f80ad85edcafe8f320360c' 
  AND token = '6DtYnvLfWu0+zLJsy0FBIF7vCDxGaSluk05Dlb2eARA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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