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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e451239dd28800581a9368a66bf4d9394178f890e9749b4a57f3a1273f838c' 
  AND token = 'JjRK5suwL67adXaNfQUVjQcX07Tr3uMxcIxmywjcCTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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