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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035ffef43455bd34bcf01b05899d33aaaec2649a1d09ed52193ebdecf73d68f8' 
  AND token = 'dHPLJiyDKx2nR4YKN8/0DoHiU3rtmG5zp5XP0dboqKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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