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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b399c15c074ce4bf9c780f70e5efe176643c9952d6585017dc640898feee0b9' 
  AND token = 'XQEIpK4P4Td6Lxz8bNcpk7gwd6IPAuzjnD0/cy7jFCc=' 
  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"
    }
  }
}