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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208308cf22dd9b7e97b136b8b6bd455b1400ae60cc8fb822f53f778dae18c4ec' 
  AND token = 'arFgHsbBxzsYbRnLRauk6/Q5h/P7C89MBk8y4MLfsgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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