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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7091f354fcfadbe36cdc56acb3df9c3e682a5e0576db80bc97fe4e0ea156eb8' 
  AND token = '3rFCZOlRhW5INS/kUDs21HkMnknP+EI1svCt/Zf7Uo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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