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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fe1cabcf57143773adae40f426cd09caa67dd68833df19fe5a0b089961954e' 
  AND token = 'hSJJQtsuJD/v/M0ZDLYIy5VXt/9MWlMGWAx7rXU52bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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